Implements minimal, secure login without username display:
1. **LightDM Installation**:
- Added lightdm and lightdm-gtk-greeter packages
- Enabled LightDM service by default
- Set default target to graphical
- Removed .xinitrc direct X boot
2. **Minimal and Secure Greeter**:
- Configured /etc/lightdm/lightdm.conf:
* hide-users=true (no username list displayed)
* show-manual-login=true (manual username entry only)
* allow-guest=false (no guest sessions)
* XDMCP disabled (no remote X sessions)
- Greeter shows only:
* Username field (for manual entry)
* Password field
* Login button
- No account picking, no user list
3. **Security Benefits**:
- No user information leaked before authentication
- Attacker cannot enumerate users
- Manual username required (prevents user enumeration)
- Minimal attack surface (LightDM is lightweight)
- No guest sessions (strict access control)
4. **Removed Direct X Boot**:
- No longer booting directly to IceWM via .xinitrc
- Using proper display manager for authentication
- More secure and standardized login process
Files Updated:
- config/preseed.cfg (LightDM packages, enabled service, late_command)
- config/security-config.sh (LightDM configuration, removed .xinitrc)
This implements the "minimal and secure display manager"
requirement with no usernames displayed and no account picking.
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Charles N Wyble
c96bd20708